Response to Acetic acid as stop bath

Yes, straight or "glacial" acetic acid is very irritating and corrosive. Use caution. If I am using Glacial acetic, I mix about a capful at most with water to about half fill an 8 x 10 tray. Not critical. If using 28% acetic acid (common way of selling it) I believe the dilution is about 1:4 to 1:6. If your prints "sing" or sizzle when you drop them into the stop bath, it is mixed too strong. Kodak Indicator Stop Bath changes color when it is exhausted.

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